单项选择题

A．By the end of this century.
B．By the first half of this century.
C．By the second half of this century.
D．In the middle of this century.
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单项选择题
A．To persuade Mary to spend more time on her lessons.B．To help Mary to prepare for the upcoming concert.C．To talk with Mary about going to the concert.D．To ask Mary to stop worrying about the exam.
A．To persuade Mary to spend more time on her lessons.
B．To help Mary to prepare for the upcoming concert.
C．To talk with Mary about going to the concert.
D．To ask Mary to stop worrying about the exam.
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